Technology

Sechs technology and machinery are different from modern concept of machinery.

To illustrate this, Hashimoto chose two examples: the concept of aether, an idea modern science has rendered obsolete, and Japanese scientists of Edo Period.

In other words, Sechs science is similar to real world's old sciences like phlogiston, and unlike in real world, their science works.

Unlike Sechs's machine civilization, Norad has developed a magic civilization.

The Rune Factory world is quite paradoxical with its technology, for while they have Refrigerators and electricity, they seem to still fight with swords and an array of melee weapons.

To illustrate: Modern day technologies such as fridges, tanks, electricity, powered boats, and powered elevators are present throughout the games, however, the main infantry unit of the time is the medieval knight.

Religion

There are three known religions in the series, one is one similiar to the Judeo-Christian religions, the other is one similiar to Shinto, and the last is Dragon Worship- i.e, the worship of the Divine Dragons (Terrable, Fiersome, Aquaticus, and Ventuswill)

The Juedo-Christian like religion is mostly based off real world Catholicism, since it has churches and a hierarchical structure of priests (Wesley, Gordon, Gerard) and sisters (Stella, Lara).

The Shinto-like religion is mostly followed by Easterners like Shino, and is exclusive in appearance to Sharance.

The Dragon Worship has no known official followers, but cases where the dragons are respected are found (Ventuswill and Volkanon/Forte)

It is unknown if the Arch-Dragon worship of Fenith ties into this, but if so, it adds followers by the count of Lily, Odette, and Violet.

Races

Humanity originated in Norad.

Most elves live in their own country.

The elves are led by a queen and several elders.

Races such as univir and mermaids still mostly only live in certain specific regions.

Terminology

"Earthmates" are people capable of communicating with the land and the spirits.

In ancient times, an earthmate has all the earthmate powers. In modern times, an earthmate is defined as a person who's inherited part of these powers.

"Tamitaya" is essentially a magic that returns a person to where he belongs. Using tamitaya on a monster in the human world would send it back to Forest of Beginnings; using tamitaya on a human in Forest of Beginnings would send him back to the human world.

Also known as "Retornen" in american version of the games.

The Gates are just portals linking the human world to the Forest of Beginnings. As we know, the empire has developed machines to artificially "shift" monsters to the human world.

"Rune" is the life force of everything. It's love, the source of life, whatever you call it.

RP (Rune Points) is a real thing.

When vegetables are raised with care, they emit crystalized Runes.

Runeys are something very close to the spirits, capable of gathering the spirits and influencing them. When runeys create a great effect on the environment such as affecting crop growth or rainfall, whether postively or negatively, it's called a "rune wonder".

While runeys have only appeared in two games, they are in fact everywhere. Different places call them different names.

Ordinary people can see runeys.

Characters

The de Sainte-Coquille family isn't nobility.

They are also not merchants. There is no explanation where their wealth came from.

The head of the families are all big eaters; they don't live in cities because the food is tastier in rural regions.

They periodically meet each other, but these meetings are more about food than anything.

A character mentions: "Will Max's body grow like his father? No idea, certainly sounds dangerous."

Lynette comes from an elite family that has for generations contributed soldiers to the empire.

Lynette tells people she wears a eyepatch because her left eye has been wounded in battle. You may already know this isn't true.

Miko is generally translated as "shrine maiden" or priestess, but in Sharron's case, "oracle" would be a fitting description of her job. In real world history, miko did functioned as oracles. The Zelda series had translated "miko" as oracles.

Rune Factory Frontier

Iris is not human, but a race "closer to spirits". She's not a vampire.

The Whale Island used to be a place where they live. The ruins are built centuries ago.

Iris's race has a very low birth rate, and isn't very interested in reproduction. As a result, they have to crossbreed with humans to keep themselves from extinction. There may be no pure blood left now.

Rune Factory 3

Spoiler Warning:The following may contain important spoilers about characters or parts in the story.

Hazel and Shinonome didn't knew each other when they were young. However, once they met, they realized as single mothers, they have much in common.

"Shinonome's secret" is a joke. While she used to be a fighter, today she's just a mother, not some secret agent of the eastern nation. And her inn is definitely not a front for Mei and Yue's intel gathering. Mei and Yue are just two travellers who happen to stay at her inn.

The kanji for Uzuki's name is 卯月. (The word "Uzuki" means "April", but there are more than one way to write it in kanji.)

Previously we knew only this:
NNescio wrote:
"To clarify something about Shinonome's name, it's written in hiragana, but is probably meant to be 東雲, or Daybreak (lit: East Clouds), in kanji. Hiragana does lend sort of a Kansai feel. Then again, almost all of the (vaguely-) Japanese characters in the RF games have their names written in kana. Yue, Kansai accent aside, could be (vaguely-)Chinese as her name is written in katakana instead of hiragana. Mei has an inauspicious canon kanji name 冥 (dark/gloomy/death)"